| Value |
Category |
| 00 |
No schooling |
| 11 |
Primary (general) school: grade 1 |
| 12 |
Primary (general) school: grade 2 |
| 13 |
Primary (general) school: grade 3 |
| 14 |
Primary (general) school: grade 4 |
| 15 |
Primary (general) school: grade 5 |
| 16 |
Primary (general) school: grade 6 |
| 17 |
Primary (general) school: grade 7 |
| 18 |
Primary (general) school: grade 8 |
| 21 |
Higher elementary school: grade 1 |
| 22 |
Higher elementary school: grade 2 |
| 23 |
Higher elementary school: grade 3 |
| 30 |
Certificate of skilled worker: acquired at the day section of an apprentice school (in 1961 or later) |
| 40 |
Certificate of skilled worker: acquired at the day section of an apprentice school (in 1976 or later) |
| 50 |
Secondary school final examination, school leaving certificate |
| 60 |
Diploma from a non-university third-level educational institution |
| 70 |
University diploma |
| 98 |
Unknown |
| 99 |
NIU (not in universe) |
Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.